package com.project.receive.strategy.handler;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import com.project.logistics.config.FixedRuleProperties;
import com.project.logistics.config.SfApiProperties;
import com.project.logistics.config.WebDavProperties;
import com.project.logistics.domain.entity.ApiRetryTaskEntity;
import com.project.logistics.domain.entity.LogisticsOrderEntity;
import com.project.logistics.domain.enums.OrderStatusEnum;
import com.project.logistics.domain.enums.RetryActionEnum;
import com.project.logistics.domain.service.WebDavService;
import com.project.logistics.domain.service.base.LogisticsOrderService;
import com.project.logistics.domain.strategy.ApiTaskHandler;
import com.project.logistics.domain.utils.FilePathUtil;
import com.project.receive.domain.entity.PodPushLogEntity;
import com.project.receive.domain.service.base.PodPushLogService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Base64;
import java.util.Date;

@Slf4j
@Component
public class SfDownloadPodHandler implements ApiTaskHandler {

    @Autowired
    private PodPushLogService podPushLogService;
    @Autowired
    private LogisticsOrderService logisticsOrderService;
    @Autowired
    private WebDavService webDavService;
    @Autowired
    private FixedRuleProperties fixedRuleProperties;

    @Autowired
    private WebDavProperties webDavProperties;

    @Autowired
    private SfApiProperties sfApiProperties;

    @Override
    public String getActionCode() {
        return RetryActionEnum.SF_DOWNLOAD_POD.getCode();
    }

    @Override
    public void handle(ApiRetryTaskEntity task, LogisticsOrderEntity order) throws Exception {
        // 1. 获取原始密文数据
        PodPushLogEntity podLog = podPushLogService.lambdaQuery()
                .eq(PodPushLogEntity::getWaybillNo, order.getSfWaybillNo())
                .orderByDesc(PodPushLogEntity::getId)
                .last("LIMIT 1").one();

        if (podLog == null || StrUtil.isBlank(podLog.getRawPushData())) {
            throw new RuntimeException("流水表中未发现加密的回单数据，等待顺丰推送...");
        }

        log.info(">>> 任务执行：开始解密单号 {} 的原始报文", order.getOrderNo());

        // 2. 执行解密逻辑 (AES解密 + 二次解码)
        byte[] finalPdfBytes;
        try {
            // 获取并处理 Key (CheckWord 前16位)
//            String secret = "b283e485aad2a78f";

            String secret = sfApiProperties.getPodSecret();

            if (StrUtil.isBlank(secret)) {
                secret = "axjGikuWgvYkI3JA"; // 沙箱
            }
            if (secret.length() > 16) {
                secret = secret.substring(0, 16);
            }

            finalPdfBytes = decryptAndDecode2(podLog.getRawPushData(), secret);
        } catch (Exception e) {
            log.error(">>> 解密失败: {}", e.getMessage());
            throw new RuntimeException("DECRYPT_PROCESS_FAILED: " + e.getMessage());
        }

        // 3. 上传 WebDAV
        String datePath = FilePathUtil.getHierarchicalPath(new Date());
        String fileName = order.getOrderNo() + ".pdf";
        String fullSavePath = webDavProperties.getPodRoot() + "/" + datePath + "/" + fileName;

        webDavService.uploadFile(fullSavePath , finalPdfBytes);

        // 4. 更新订单和日志状态
        order.setPodPdfPath(fullSavePath);
        order.setOrderStatus(OrderStatusEnum.FINISHED.getCode()); // 流程结束
        logisticsOrderService.updateById(order);

        podLog.setProcessStatus(1); // 成功
        podPushLogService.updateById(podLog);

        log.info(">>> 回单处理成功并已上传 WebDAV: {}", fullSavePath);
    }

    /**
     * 内部解密方法：AES -> Base64解码
     */
    private byte[] decryptAndDecode(String rawEncryptedBase64, String secret) throws Exception {
        // A. 第一次解码：密文Base64 -> 密文字节
        byte[] cipherText = Base64.getDecoder().decode(rawEncryptedBase64.trim().replaceAll("\\s+", ""));

        // B. AES 解密
        SecretKeySpec skeySpec = new SecretKeySpec(secret.getBytes("UTF-8"), "AES");
        IvParameterSpec iv = new IvParameterSpec(new byte[16]); // 16个0
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] decryptedBytes = cipher.doFinal(cipherText);

        // C. 第二次解码：顺丰解密后的字节其实是 PDF 的 Base64 字符串
        String pdfBase64Str = new String(decryptedBytes, "UTF-8").trim();
        return Base64.getDecoder().decode(pdfBase64Str);
    }

    public static byte[] ivBytes = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00 };

    private byte[] decryptAndDecode2(String rawEncryptedBase64, String secret) throws Exception {
        // 1. 密钥深度清理：去空格、确保16位
        String cleanedSecret = secret.trim();
        if (cleanedSecret.length() > 16) {
            cleanedSecret = cleanedSecret.substring(0, 16);
        }
        byte[] keyBytes = cleanedSecret.getBytes(StandardCharsets.UTF_8);

        // 2. 密文深度清理：去除所有换行、回车、空格
        // 关键点：Standard Decoder 遇到换行会出问题，必须手动清理或使用 MimeDecoder
        String cleanedPayload = rawEncryptedBase64.trim().replaceAll("\\s", "");

        // 3. 使用 MimeDecoder (更稳健，会自动忽略非法字符)
        byte[] encryptedBytes = Base64.getMimeDecoder().decode(cleanedPayload);

        // 4. AES 解密配置
        SecretKeySpec newKey = new SecretKeySpec(keyBytes, "AES");
        // 顺丰 POD 推送固定使用 16 个 0 字节作为 IV
        IvParameterSpec ivSpec = new IvParameterSpec(new byte[16]);

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, newKey, ivSpec);

        byte[] decryptedResult;
        try {
            log.info("DEBUG: 待解密字节数组长度: {}", encryptedBytes.length);
            decryptedResult = cipher.doFinal(encryptedBytes);
        } catch (Exception e) {
            log.error("AES解密失败！密钥长度: {}, 密文字节长度: {}", keyBytes.length, encryptedBytes.length);
            throw e;
        }

        // 5. 顺丰解出的是 PDF 的 Base64 文本，需要进行二次解码
        String pdfBase64Str = new String(decryptedResult, StandardCharsets.UTF_8).trim().replaceAll("\\s", "");
        return Base64.getMimeDecoder().decode(pdfBase64Str);
    }
}